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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
O₂ content in atmospheric air on weight basis is

0.3
0.4
0.21
0.23

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Steam Boilers, Engines, Nozzles and Turbines
An economiser _________ the steam raising capacity of a boiler.

Has no effect on
Decreases
Increases
None of these

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Steam Boilers, Engines, Nozzles and Turbines
A supercritical boiler is one that operates above the pressure and temperature of following values

218 kg/cm² abs and 373°C
218 kg/cm² abs and 540°C
100 kg/cm² and 540°C
1 kg/cm² and 100°C

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Steam Boilers, Engines, Nozzles and Turbines
The critical pressure ratio for initially dry saturated steam is

0.577
0.582
0.601
0.546

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Steam Boilers, Engines, Nozzles and Turbines
Which of the following gases has the highest calorific value?

Water gas
Blast furnace gas
Producer gas
Coal gas

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Steam Boilers, Engines, Nozzles and Turbines
A compound steam engine in which the high pressure and low pressure cylinders have common piston rod, is called

None of these
Tandem type compound engine
Woolf type compound engine
Receiver type compound engine

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